1.

1: A connection had long been suspected P: since both were at their worst in the Q: same regions and seasons, but the nature R: between the abundance of mosquitoes S: and the occurrence of mosquitoes 6: of this connection had not been understood.

A. RQSP
B. RSQP
C. RSPQ
D. PQRS
Answer» D. PQRS


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